title: Wear behavior of light-cured resin composites with bimodal silica nanostructures as fillers.
abstract: To enhance wear behavior of resin composites, bimodal silica nanostructures including silica nanoparticles and silica nanoclusters were prepared and proposed as fillers. The silica nanoclusters, a combination of individually dispersed silica nanoparticles and their agglomerations, with size distribution of 0.07-2.70 μm, were fabricated by the coupling reaction between amino and epoxy functionalized silica nanoparticles, which were obtained by the surface modification of silica nanoparticles (~70 nm) using 3-aminopropyl triethoxysilane (APTES) and 3-glycidoxypropyl trimethoxysilane (GPS) as coupling agents, respectively. Silica nanoparticles and nanoclusters were then silanized with 3-methacryloxypropyl trimethoxysilane (γ-MPS) to prepare composites by mixing with bisphenol A glycerolate dimethacrylate (Bis-GMA) and tri (ethylene glycol) dimethacrylate (TEGDMA). Experimental composites with various filler compositions were prepared and their wear behaviors were assessed in this work. The results suggested that composites with increasing addition of silica nanoparticles in co-fillers possessed lower wear volume and smoother worn surface. Particularly, the composite 53:17 with the optimum weight ratio of silica nanoparticles and silica nanoclusters presented the excellent wear behavior with respect to that of the commercial Esthet-X, although the smallest wear volume was achieved by Z350 XT. The introduction of bimodal silica nanostructures as fillers might provide a new sight for the design of resin composites with significantly improved wear resistance.
authors.affiliation: State Key Laboratory for Modification of Chemical Fibers and Polymer Materials, College of Material Science and Engineering, Donghua University, Shanghai 201620, P.R. China.
authors.forename: Ruili
authors.initials: R
authors.lastname: Wang
authors.forename: Shuang
authors.initials: S
authors.lastname: Bao
authors.forename: Fengwei
authors.initials: F
authors.lastname: Liu
authors.forename: Xiaoze
authors.initials: X
authors.lastname: Jiang
authors.forename: Qinghong
authors.initials: Q
authors.lastname: Zhang
authors.forename: Bin
authors.initials: B
authors.lastname: Sun
authors.forename: Meifang
authors.initials: M
authors.lastname: Zhu
mesh_terms: D017438:Bisphenol A-Glycidyl Methacrylate / Q000737:chemistry; D003188:Composite Resins / Q000737:chemistry*; D008027:Light; D053758:Nanoparticles / Q000737:chemistry; D049329:Nanostructures / Q000737:chemistry*; D010316:Particle Size; D011092:Polyethylene Glycols / Q000737:chemistry; D011109:Polymethacrylic Acids / Q000737:chemistry; D011437:Propylamines; D012821:Silanes / Q000737:chemistry; D012822:Silicon Dioxide / Q000737:chemistry*; D013499:Surface Properties
chemical_list: C403136:3-glycidoxypropyltrimethoxysilane; D003188:Composite Resins; C466112:Esthet-X; D011109:Polymethacrylic Acids; D011437:Propylamines; D012821:Silanes; C020946:triethylene glycol dimethacrylate; D011092:Polyethylene Glycols; D017438:Bisphenol A-Glycidyl Methacrylate; D012822:Silicon Dioxide; C477625:amino-propyl-triethoxysilane
keywords: Dental restorative composites; Filler compositions; Silica nanoclusters; Silica nanoparticles; Wear behavior